Markdown Commands and MVS improvements (#1597)

* add query command to markdown extensions

* fix typo

* better postprocessing param support in MVS

* molstar_mesh/label/line_params

docs/docs/plugin/managers/markdown-extensions.md

@@ -14,12 +14,20 @@ The main use case of this is enriching [MolViewSpec](`https://molstar.org/mol-vi
 
 Extends Markdown Hyperlink syntax to support expressions of the form `[title](!c1=v1&c2=v2&...)` into an executable command. The command can be executed either on click, mouse enter, or mouse leave.
 
+Generally, the command should be URL encoded, e.g., `a b` => `a%20b` (in JS, `encodeURIComponent`, in Python `urllib.parse.quote_plus/urlencode`).
+
 ### Built-in Commands
 
 - `center-camera` - Centers the camera
 - `apply-snapshot=key` - Loads snapshots with the provided key
 - `focus-refs=ref1,ref2,...` - On click, focuses nodes with the provided refs
 - `highlight-refs=ref1,ref2,...` - On mouse over, highlights the provided refs
+- `query=...&lang=...&action=highlight,focus&focus-radius=...`
+  - `query` is an expression (e.g., `resn HEM` when using PyMol syntax)
+  - (optional) `lang` is one of `mol-script` (default), `pymol`, `vmd`, `jmol`
+  - (optional) `action` is an array of `highlight` (default), `focus` (multiple actions can be specified)
+  - (optional) `focus-radius` is extra distance applied when focusing the selection (default is `3`)
+  - Example: `[HEM](!query%3Dresn%20HEM%26lang%3Dpymol%26action%3Dhighlight%2Cfocus)` highlights or focuses the HEM residue (the command must be URL encoded because it contains spaces and possibly other special characters)
 
 ## Custom Content
 
@@ -28,7 +36,7 @@ Extends Markdown Image syntax to support expressions of the form `![alt](!c1=v1&
 ### Built-in Custom Content
 - `color-swatch=color` - Renders a box with the provided color
 -  Color palettes:
-  - `color-palette-name=name` - Renders a gradient with the provivided named color palette (see `mol-util/color/lists.ts` for supported color schemes)
+  - `color-palette-name=name` - Renders a gradient with the provided named color palette (see `mol-util/color/lists.ts` for supported color schemes)
   - `color-palette-colors=color1,color2` - Renders a gradient with the provided colors
   - `color-palette-width=CCS-value` - Specifies the width of the element, defaults to `150px`
   - `color-palette-height=CCS-value` - Specified the height of the element, defaults to `0.5em`